/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.mengmeng.quicklymessage.contact;

import com.mengmeng.quicklymessage.R;

import android.content.AsyncTaskLoader;
import android.content.Context;
import android.content.pm.PackageManager;
import android.database.ContentObserver;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;
import android.os.Handler;
import android.provider.ContactsContract.Directory;
import android.text.TextUtils;
import android.util.Log;

/**
 * A specialized loader for the list of directories, see {@link Directory}.
 */
public class DirectoryListLoader extends AsyncTaskLoader<Cursor> {

    private static final String TAG = "ContactEntryListAdapter";

    public static final int SEARCH_MODE_NONE = 0;
    public static final int SEARCH_MODE_DEFAULT = 1;
    public static final int SEARCH_MODE_CONTACT_SHORTCUT = 2;
    public static final int SEARCH_MODE_DATA_SHORTCUT = 3;

    private static final class DirectoryQuery {
        public static final Uri URI = Directory.CONTENT_URI;
        public static final String ORDER_BY = Directory._ID;

        public static final String[] PROJECTION = { Directory._ID,
                Directory.PACKAGE_NAME, Directory.TYPE_RESOURCE_ID,
                Directory.DISPLAY_NAME, Directory.PHOTO_SUPPORT, };

        public static final int ID = 0;
        public static final int PACKAGE_NAME = 1;
        public static final int TYPE_RESOURCE_ID = 2;
        public static final int DISPLAY_NAME = 3;
        public static final int PHOTO_SUPPORT = 4;
    }

    public static final String DIRECTORY_TYPE = "directoryType";

    private static final String[] RESULT_PROJECTION = { Directory._ID,
            DIRECTORY_TYPE, Directory.DISPLAY_NAME, Directory.PHOTO_SUPPORT, };

    private final ContentObserver mObserver = new ContentObserver(new Handler()) {
        @Override
        public void onChange(boolean selfChange) {
            forceLoad();
        }
    };

    private int mDirectorySearchMode;
    private boolean mLocalInvisibleDirectoryEnabled;

    private MatrixCursor mDefaultDirectoryList;

    public DirectoryListLoader(Context context) {
        super(context);
    }

    public void setDirectorySearchMode(int mode) {
        mDirectorySearchMode = mode;
    }

    /**
     * A flag that indicates whether the {@link Directory#LOCAL_INVISIBLE}
     * directory should be included in the results.
     */
    public void setLocalInvisibleDirectoryEnabled(boolean flag) {
        this.mLocalInvisibleDirectoryEnabled = flag;
    }

    @Override
    protected void onStartLoading() {
        getContext().getContentResolver().registerContentObserver(
                Directory.CONTENT_URI, false, mObserver);
        forceLoad();
    }

    @Override
    protected void onStopLoading() {
        getContext().getContentResolver().unregisterContentObserver(mObserver);
    }

    @Override
    public Cursor loadInBackground() {
        if (mDirectorySearchMode == SEARCH_MODE_NONE) {
            return getDefaultDirectories();
        }

        MatrixCursor result = new MatrixCursor(RESULT_PROJECTION);
        Context context = getContext();
        PackageManager pm = context.getPackageManager();
        String selection;
        switch (mDirectorySearchMode) {
        case SEARCH_MODE_DEFAULT:
            selection = mLocalInvisibleDirectoryEnabled ? null : (Directory._ID
                    + "!=" + Directory.LOCAL_INVISIBLE);
            break;

        case SEARCH_MODE_CONTACT_SHORTCUT:
            selection = Directory.SHORTCUT_SUPPORT
                    + "="
                    + Directory.SHORTCUT_SUPPORT_FULL
                    + (mLocalInvisibleDirectoryEnabled ? "" : (" AND "
                            + Directory._ID + "!=" + Directory.LOCAL_INVISIBLE));
            break;

        case SEARCH_MODE_DATA_SHORTCUT:
            selection = Directory.SHORTCUT_SUPPORT
                    + " IN ("
                    + Directory.SHORTCUT_SUPPORT_FULL
                    + ", "
                    + Directory.SHORTCUT_SUPPORT_DATA_ITEMS_ONLY
                    + ")"
                    + (mLocalInvisibleDirectoryEnabled ? "" : (" AND "
                            + Directory._ID + "!=" + Directory.LOCAL_INVISIBLE));
            break;

        default:
            throw new RuntimeException("Unsupported directory search mode: "
                    + mDirectorySearchMode);
        }

        Cursor cursor = context.getContentResolver().query(DirectoryQuery.URI,
                DirectoryQuery.PROJECTION, selection, null,
                DirectoryQuery.ORDER_BY);
        try {
            while (cursor.moveToNext()) {
                long directoryId = cursor.getLong(DirectoryQuery.ID);
                String directoryType = null;

                String packageName = cursor
                        .getString(DirectoryQuery.PACKAGE_NAME);
                int typeResourceId = cursor
                        .getInt(DirectoryQuery.TYPE_RESOURCE_ID);
                if (!TextUtils.isEmpty(packageName) && typeResourceId != 0) {
                    try {
                        directoryType = pm.getResourcesForApplication(
                                packageName).getString(typeResourceId);
                    } catch (Exception e) {
                        Log.e(TAG,
                                "Cannot obtain directory type from package: "
                                        + packageName);
                    }
                }
                String displayName = cursor
                        .getString(DirectoryQuery.DISPLAY_NAME);
                int photoSupport = cursor.getInt(DirectoryQuery.PHOTO_SUPPORT);
                result.addRow(new Object[] { directoryId, directoryType,
                        displayName, photoSupport });
            }
        } finally {
            cursor.close();
        }

        return result;
    }

    private Cursor getDefaultDirectories() {
        if (mDefaultDirectoryList == null) {
            mDefaultDirectoryList = new MatrixCursor(RESULT_PROJECTION);
            mDefaultDirectoryList.addRow(new Object[] { Directory.DEFAULT,
                    getContext().getString(R.string.contactsList), null });
            mDefaultDirectoryList.addRow(new Object[] {
                    Directory.LOCAL_INVISIBLE,
                    getContext().getString(R.string.local_invisible_directory),
                    null });
        }
        return mDefaultDirectoryList;
    }

    @Override
    protected void onReset() {
        stopLoading();
    }
}
